Wireless communication device capable to transmit/receive TTY/TDD messages with variable data rate, embedded into audio data frames
US6628967B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1999 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Dec 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/72478
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A wireless communication device capable to transmit and receive TTY/TDD characters. The wireless communication device includes a receiver and a transmitter to allow for a full duplex communication. The receiver is responsive to the reception of a data frame including a TTY/TDD silence message to switch to lower data rate operative state where the receiver expects to receive and process data frames at a lower data rate. At the same time the receiver causes the transmitter to switch to a lower data rate operative state and also to return to the remote site with which the wireless communication device communicates a TTY/TDD silence message. The purpose of this TTY/TDD silence message is to set the receiver at the remote site at the lower data rate operative state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.